Evidence suggests that adolescents and adults experience activation in similar brain regions when they engage in tasks that involve the processing of emotional stimuli. However, the degree of task-associated activation may differ between adolescents and adults. This study will use functional magnetic resonance imaging (fMRI) to compare brain activation patterns in adolescents and adults. This study will also be used to develop emotion-evoking fMRI tasks to determine whether there are puberty and age-linked components of brain development.